Oracle :: Tablespace size

select a.TABLESPACE_NAME, a.BYTES bytes_used, b.BYTES bytes_free, b.largest, round(((a.BYTES-b.BYTES)/a.BYTES)*100,2) percent_usedfrom ( select TABLESPACE_NAME, sum(BYTES) BYTES from dba_data_files group by TABLESPACE_NAME ) a, ( select TABLESPACE_NAME, sum(BYTES) BYTES , max(BYTES) largest from dba_free_space group by TABLESPACE_NAME ) bwhere a.TABLESPACE_NAME=b.TABLESPACE_NAME order by ((a.BYTES-b.BYTES)/a.BYTES) desc